的Android添加文本视图

Question

好吧，我宣布我的main.xml如下

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
android:layout_width="wrap_content" 
android:layout_height="fill_parent" 
android:layout_gravity="center_horizontal" > 

<RelativeLayout 
    android:id="@+id/AdMob" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_alignParentTop="true" 
    android:layout_alignParentRight="true" > 
</RelativeLayout> 

<ScrollView 
    android:id="@+id/scrollview1" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    android:layout_below="@id/AdMob" > 

    <TableLayout 
     android:id="@+id/tablelayout1" 
     android:layout_width="fill_parent" 
     android:layout_height="wrap_content" 
     android:orientation="vertical" > 

     <TableRow 
      android:id="@+id/tableRow0" 
      android:layout_height="wrap_content" 
      android:background="@drawable/banner" /> 

     <TableRow 
      android:id="@+id/tableRow1" 
      android:layout_height="wrap_content" > 

      <TextView 
       android:id="@+id/start_message" 
       android:layout_width="fill_parent" 
       android:layout_height="wrap_content" 
       android:layout_gravity="center" 
       android:gravity="center" 
       android:textSize="15sp" /> 

     </TableRow> 

     <TableRow 
      android:id="@+id/tableRow2" 
      android:layout_height="wrap_content" > 

      <Button 
       android:id="@+id/start" 
       android:layout_width="wrap_content" 
       android:layout_height="fill_parent" 
       android:text="Start Now" > 
      </Button> 
     </TableRow> 
    </TableLayout> 
</ScrollView> 

</RelativeLayout> 

，我的主要活动是

package com.michaelpeerman.demotivational_posters; 

import com.michaelpeerman.demotivational_posters.R; 

import android.app.Activity; 
import android.os.Bundle; 
import android.text.Html; 
import android.widget.TextView; 

public class MainActivity extends Activity { 
/** Called when the activity is first created. */ 
@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 
    TextView start_message = (TextView) findViewById(R.id.start_message); 
    start_message.setText(Html.fromHtml("Thank you for downloading \"Demotivational Posters\" \n Click start below to start. \n To advance to the next picture click the \"Next\" button. \n If you see an image you would like to download click the \"Download\" button. \n If you enjoy this app please leave a rating.")); 
} 
} 

当我去编译我的程序也力自动关闭。该logcat的输出是

03-13 01:59:50.240: E/AndroidRuntime(14336): FATAL EXCEPTION: main 
03-13 01:59:50.240: E/AndroidRuntime(14336): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.michaelpeerman.demotivational_posters/com.michaelpeerman.demotivational_posters.MainActivity}: java.lang.ClassCastException: android.widget.TableRow cannot be cast to android.widget.TextView 
03-13 01:59:50.240: E/AndroidRuntime(14336): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956) 
03-13 01:59:50.240: E/AndroidRuntime(14336): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981) 
03-13 01:59:50.240: E/AndroidRuntime(14336): at android.app.ActivityThread.access$600(ActivityThread.java:123) 
03-13 01:59:50.240: E/AndroidRuntime(14336): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147) 
03-13 01:59:50.240: E/AndroidRuntime(14336): at android.os.Handler.dispatchMessage(Handler.java:99) 
03-13 01:59:50.240: E/AndroidRuntime(14336): at android.os.Looper.loop(Looper.java:137) 
03-13 01:59:50.240: E/AndroidRuntime(14336): at android.app.ActivityThread.main(ActivityThread.java:4424) 
03-13 01:59:50.240: E/AndroidRuntime(14336): at java.lang.reflect.Method.invokeNative(Native Method) 
03-13 01:59:50.240: E/AndroidRuntime(14336): at java.lang.reflect.Method.invoke(Method.java:511) 
03-13 01:59:50.240: E/AndroidRuntime(14336): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 
03-13 01:59:50.240: E/AndroidRuntime(14336): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 
03-13 01:59:50.240: E/AndroidRuntime(14336): at dalvik.system.NativeStart.main(Native Method) 
03-13 01:59:50.240: E/AndroidRuntime(14336): Caused by: java.lang.ClassCastException: android.widget.TableRow cannot be cast to android.widget.TextView 
03-13 01:59:50.240: E/AndroidRuntime(14336): at com.michaelpeerman.demotivational_posters.MainActivity.onCreate(MainActivity.java:16) 
03-13 01:59:50.240: E/AndroidRuntime(14336): at android.app.Activity.performCreate(Activity.java:4465) 
03-13 01:59:50.240: E/AndroidRuntime(14336): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049) 
03-13 01:59:50.240: E/AndroidRuntime(14336): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920) 
03-13 01:59:50.240: E/AndroidRuntime(14336): ... 11 more 

我想不通这是什么意思，我的铸造到的TableRow TextView的

Answer 1

您需要清洗并再次重建项目。如果这不起作用，请关闭您的项目并再次打开并刷新项目并运行。我试着用你给定的代码。它是在我的情况下工作。